I helped install radiant heating in my dad's barn/shop. Same concept, he heats the water with an outdoor wood-fired boiler. We laid 2 inch pink foam board (R-10) on the leveled ground and secured the pex loops to the foamboard with plastic staples. You have to be careful when pouring the concrete that you don't move the shoot too fast and pop all the staples out. He only heats the shop to 40 or 50 degrees because it has 20 foot ceilings, but the walls are extruded foam insulation with a bed of cellulose in the ceiling. In a smaller room you can really crank up the heat just from the floor. Poured into cement seems to be the most efficient transfer, followed by tile. Wood floors not so good, especially if they are floating laminate because the padding acts as a barrier. I would think rather than running tubes through the wall if you wanted additional heat it would be easier and cheaper to use baseboard radiant heaters. You would still want it in the floor if you have cement though. Jeremy West Michigan *********************************************** The BEE-L mailing list is powered by L-Soft's renowned LISTSERV(R) list management software. For more information, go to: http://www.lsoft.com/LISTSERV-powered.html